What to do when dynasty league downsizes? From 14 to 12!

Our home dynasty league of many years is downsizing from 14 teams to 12 teams. (The two owners left in peace we didn’t have to force anyone out.) Now we are trying to find a unique and fair way to put their players back into the league. Whatever way we do this, the league would like to keep those players separate from our annual rookie draft. Any ideas? What did some of your leagues do in this situation?

Thanks in advance for the feedback!